The schematic below is what I used for the sequencer (click to enlarge). I’m sure there’s room for improvement, but this has worked so far.

I’ve rebuilt this circuit a few times for different projects. In some cases it is better to remove the 4016 IC and use relays. Or sometimes you can just use transistors as switches. Here’s a schematic sent to me by SUBBS (click to enlarge). He’s adapted the sequencer design to function as a multi channel, rhythmic tone generator. Looks pretty cool.

Here’s a Speak&Spell with a built in 8 step, 1 channel sequencer based on the schematic above. Lots of possibilities.